git: ufs,ext2fs: Fix -Warray-bounds warnings from GCC 12.5

[Aaron LI]

commit 4fcf2e1bacc201e0111c60a5d2991eb19724949e
Author: Aaron LI <aly at aaronly.me>
Date:   Wed Oct 14 12:28:42 2026 +0800

    ufs,ext2fs: Fix -Warray-bounds warnings from GCC 12.5
    
    The code of using 'struct dirtemplate' in ufs_dirempty() and
    ext2_dirempty() was added in 1983 the 4.4BSD era, with the intention of
    reducing stack use then [1].  However, this optimization is no longer
    need now as we have larger stack space, so revert to use the real
    'struct direct' or 'struct ext2fs_direct_2' to silence the warnings.
    
    While there, adjust the MINDIRSIZ definition and rename 'count' to
    'resid' to clean up the code a bit.
    
    [1] cleanup dirempty to cut down on stack space used and speed up a tad
        https://github.com/weiss/original-bsd/commit/de69dc11a62d21d77105282cc2d8b0cac21e1587
    
    GCC 12.5 warnings example:
    ```
    /usr/src/sys/vfs/ufs/ufs_lookup.c: In function 'ufs_dirempty':
    /usr/src/sys/vfs/ufs/ufs_lookup.c:1076:23: warning: array subscript 'struct direct[0]' is partly outside array bounds of 'struct dirtemplate[1]' [-Warray-bounds]
     1076 |                 if (dp->d_reclen == 0)
          |                       ^~
    /usr/src/sys/vfs/ufs/ufs_lookup.c:1061:28: note: object 'dbuf' of size 24
     1061 |         struct dirtemplate dbuf;
          |                            ^~~~
    ```

Summary of changes:
 sys/vfs/ext2fs/ext2_lookup.c | 15 ++++++---------
 sys/vfs/ufs/ufs_lookup.c     | 15 ++++++---------
 2 files changed, 12 insertions(+), 18 deletions(-)

http://gitweb.dragonflybsd.org/dragonfly.git/commitdiff/4fcf2e1bacc201e0111c60a5d2991eb19724949e


-- 
DragonFly BSD source repository